AC Losses and Magnetic Coupling in
Multifilamentary Coated HTS Conductors and Tape Arrays

M. Marchevsky, E. Zhang, Y-Y. Xie,
V. Selvamanickam and G. Pethuraja

Abstract— Striation of coated HTS conductors is a promising way of reducing their ac loss. In particular, loss in the striated conductors is affected by magnetic coupling between the superconducting filaments. We experimentally study the in-field behavior of the planar arrays of superconducting tapes and deduct contribution of such coupling to the net ac loss. This contribution is largest at lowest ac field amplitudes. Dependence of the loss upon the inter-filament separation is studied and results are compared to the existing theoretical models and numerical simulations. We show that magnetization ac loss of practical multi-filamentary conductors can be reasonably fitted with the theoretical result of Mawatari et al. for infinite arrays of magnetically-coupled superconducting strips.

Index Terms—AC measurements, magnetization loss, magnetic coupling, coated conductors.

Manuscript received 19 August 2008.
This work was supported in part by the U.S. Air Force Reserarch Laboratory, Dayton OH
M. Marchevsky, E. Zhang, Y-Y. Xie, V. Selvamanickam are with SuperPower, Inc, 450 Duane Ave, Schenectady NY 12304 USA (phone: 518-346-1414; fax 518-346-6080; e-mail marchev@superpower-inc.com )
G. Pethuraja is with the Rensselaer Polytechnic Institute, Troy NY , 12180 USA

Full Text, PDF